Lindsay Lohan to Get Naked For Sex Book?

Has Lindsay Lohan agreed strip down buck naked for a full-frontal photo spread in a "sex book" with James Franco of all people? That's the rumor going around.

A rumor LiLo flatly denies, calling the whole idea "gross."

Lohan tells friends she'd NEVER do a sex book despite reports she signed a multi-million dollar deal to pose with Franco in a series of "graphic" nude photos for a Madonna-esque book with photographer Terry Richardson.

Why would we ever assume Lindsay Lohan would pose nude?!

However, according to a TMZ report, Lohan HAS agreed to a milder photo shoot with Richardson ... in a book about the "glamor and history" of Hollywood.

No word if Franco is involved in that shoot as well, but it'd probably be a better career move than hosting the Oscars. Man, was he ever terrible on Sunday.

Sex book or no sex book, LiLo is no stranger to risque photo shoots. Click to enlarge some of the more provocative Lindsay Lohan pictures in question ...